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#ifndef QSHAKERECOGNIZER_H
#define QSHAKERECOGNIZER_H

#include <QDebug>

#include <qsensorgesturerecognizer.h>

#include "qtsensorgesturesensorhandler.h"

QT_BEGIN_NAMESPACE

struct ShakeData {
   qreal x;
   qreal y;
   qreal z;
};

class QShake2SensorGestureRecognizer : public QSensorGestureRecognizer
{
    Q_OBJECT

public:

    enum ShakeDirection {
        ShakeUndefined = 0,
        ShakeLeft,
        ShakeRight,
        ShakeUp,
        ShakeDown
    };

    QShake2SensorGestureRecognizer(QObject *parent = 0);
    ~QShake2SensorGestureRecognizer();

    void create() Q_DECL_OVERRIDE;

    QString id() const Q_DECL_OVERRIDE;
    bool start() Q_DECL_OVERRIDE;
    bool stop() Q_DECL_OVERRIDE;
    bool isActive() Q_DECL_OVERRIDE;

    int timerTimeout;


Q_SIGNALS:
    void shakeLeft();
    void shakeRight();
    void shakeUp();
    void shakeDown();

private slots:
    void accelChanged(QAccelerometerReading *reading);
    void timeout();


private:
    QAccelerometerReading *accelReading;

    bool active;

    ShakeDirection shakeDirection;

    ShakeData prevData;
    ShakeData currentData;

    bool checkForShake(ShakeData prevSensorData, ShakeData currentSensorData, qreal threshold);
    bool shaking;
    int shakeCount;
    int threshold;

    bool isNegative(qreal num);
    qreal lapsedTime;
    quint64 lastTimestamp;
    bool timerActive;
};
QT_END_NAMESPACE
#endif // QSHAKERECOGNIZER_H
